JPEG (Joint Photographic Experts Group)
Open BetaJPEG è un formato raster diffuso con compressione. File compatti per siti web, social media e presentazioni. Equilibrio ottimale tra qualità e dimensione del file.
Caratteristiche principali
Informazioni sul formato JPEG
JPEG is the most widespread raster format: every program, every phone and every browser opens it, and lossy compression keeps the file small. For a map it is a finished picture — drop it into a presentation, send it in a messenger, put it on a web page.
The choice between JPEG and PNG is simple. If the map has many flat fills, thin lines and labels, PNG will be cleaner: it compresses losslessly. JPEG wins on weight and suits cases where the picture goes to the web, into email or into a document and file size matters.
The map is rendered into an image and saved at quality 90 out of a hundred — the balance at which compression artifacts are invisible to the eye. Quality is adjustable from 60 to 100, the default resolution is 150 dots per inch, and the sheet is A4 in landscape orientation.
There are technical ceilings: no more than 50 million pixels per image and no more than 10,000 pixels on any side. Transparency does not exist in JPEG at all — empty places are filled with a solid color; if you need a transparent underlay, take PNG.
Quale programma apre i file JPEG
I seguenti programmi e applicazioni possono aprire, modificare ed elaborare i file JPEG (Joint Photographic Experts Group) (.jpg) esportati da OSM2CDR:
Format specifications
- Open standard
- 2D only
- Lossy compression
- No attributes
- Output: 1 file
- JPEG (ISO 10918) with adjustable quality (default 90). Smaller than PNG for photo-style raster, lossy compression.
Chi usa le mappe JPEG
Come esportare in JPEG
Come aprire il file dopo l'esportazione
- Presentations and documents — insert the .jpg into PowerPoint, Word or Google Slides as an ordinary picture.
- Web — put the file on the page; for mobile screens it makes sense to shrink it beforehand so as not to load extra megabytes.
- Photoshop, GIMP, Paint.NET — crop it, add a title or a legend; save the result once, as every re-save of a JPEG degrades the picture a little.
- Print — for a flyer JPEG is enough, but for quality printing PDF or PNG is better: they have no compression artifacts and the lines stay crisp.
Mappe popolari in JPEG
Ottieni esportazioni di mappe in JPEG (Joint Photographic Experts Group)
Scarica mappe JPEG professionali da OpenStreetMap. Generazione istantanea, qualsiasi area.